Glycidol — CAS 556-52-5 — workplace exposure limit
What is the pel (ppm) for Glycidol — CAS 556-52-5 — workplace exposure limit?
For Glycidol, pel (ppm) is disputed: 50 per osha.gov, 2 per dir.ca.gov; pel (mg/m³) is disputed: 150 per osha.gov, 6.1 per dir.ca.gov; cas no. is 556-52-5, verified against its source on 2026-08-05.
Glycidol | 556-52-5 | 50 | 150 | - |
— osha.gov, retrieved 2026-08-05
- Substance
- Glycidol verified
- CAS No.
- 556-52-5 verified
- PEL (ppm)
- 50 sources disagree
- PEL (mg/m³)
- 150 sources disagree
- NIOSH REL (ppm)
- TWA 25 per cdc.gov
- NIOSH REL (mg/m³)
- 75 per cdc.gov
What cdc.gov says
NIOSH REL TWA 25 ppm (75 mg/m3)
— cdc.gov, retrieved 2026-09-08
Substance
CDC - NIOSH Pocket Guide to Chemical Hazards - Glycidol
CAS No.
CAS No. 556-52-5
What dir.ca.gov says
556525 | | 2,3-Epoxypropanol; see Glycidol
— dir.ca.gov, retrieved 2026-08-05
Sources disagree
More than one authority states this, and they do not state the same thing. Both are reproduced with the source each came from — deciding between them is yours, not ours.
PEL (ppm)
osha.gov says pel (ppm) is 50, as of 2026-08-05.
Glycidol | 556-52-5 | 50 | 150 | - |
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
dir.ca.gov says pel (ppm) is 2, as of 2026-08-05.
556525 | | Glycidol; 2,3-epoxy-1-propanol | 2 | 6.1
https://www.dir.ca.gov/title8/5155.html
PEL (mg/m³)
osha.gov says pel (mg/m³) is 150, as of 2026-08-05.
Glycidol | 556-52-5 | 50 | 150 | - |
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
dir.ca.gov says pel (mg/m³) is 6.1, as of 2026-08-05.
556525 | | Glycidol; 2,3-epoxy-1-propanol | 2 | 6.1
Sources
- osha.govhttps://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
- cdc.govhttps://www.cdc.gov/niosh/npg/npgd0303.html
- dir.ca.govhttps://www.dir.ca.gov/title8/5155.html